Gttstaf daten



G. DALE N.

REGULATING DEVICE FOR THE TEMPERATURE OF HEATING FLUID IN HEATING SYSTEMS.

APPLICATION FILED APR. 4- I918.

- Patented 00g 21, 1919.

a7 f f STATES PATENT orrrcn I GUSTAI' Dunn, or sxfinslima," mmeon, swnnnn.

BEGULATING DEVICE FOR THE TEMPERATURE OF HEATING FLUID IN HEATING SYSTEMS.

Specification of Letters Patent.

Patented Oct. 21,1919.

1 g Application fil ed April 4, 1918. Serial No. 226,775.

To all whom it may concern:

Be it known that I, GUSTAF DALEN, a subject of the King of Sweden, residing at Skarsatra, Lidingon, Sweden, have invented new and useful Improvements in Regulating Devices [for the Temperature of Heating Fluid in Heating Systems, of which the following is a specification.

The automatic regulation of the draft of or the feeding of fuel into the fire places of heating systems, for instance such ones working with'circulating hot' water, which commonly are used in smaller buildings, hitherto has een effected by a thermostatic device placed 'upon the hot water boiler. The movements of this thermostatic device by means of suitable mechanical means are transmitted to the damper of the said boiler or to its fuel feeding device in such a manner that the draft or the feeding of the fuel is reduced when the-temperature of the hot water rlses to a certain point, while the draft or the feeding increases with a falling temperature of the said water, the consumption of the fuel thus becoming automatically regiillated corresponding to the consumption of cat. i

Although this method of regulation is very advantageous for'controlling the consumption of fuel, when the outer temperature' changes, it is, however, not possible to obtain in this way during'variatlons of the outer temperature a constant temperature in a room without simultaneously increasing ordecreasing the quantity of water circulating through theradiators of the said room, because the heat-of said water is maintained comparatively constant and therefore, in order to maintain a constant temperature 1n the room it is necessary to increase or decrease the volume of water circulatin through the radiators in proportion 1 to the c anges intemperature of the atmosphere. This increase or decrease of the quantity of water hitherto has been pro duced in different ways, usually by means of a thermostatic device placed in the room and directl or indirectly connected to a lating the supply of hot water to the radiators in such a manner that this valve is opened or throttled according to a the variatlons of the temperature of the room.

The present invention refers to an apparatus by mean-s ofwhich an automatic regthrong by the heating fluid, while one or more are exposed to the outer air. Both sets of such thermostats b means of a common member for transmisslon of force-are connected to a device for the regulation of the dr'aft'or the fuel feeding device of the boiler. These two sets of thermostats thus regulate each per se the heating of the boiler as occasion requires. On account of this cooperation and because only the sum of their actions is transmitted by means of a common force transmittin device to the draft-re ulating or fuel-fee ing device, the latter t us will be brought into a position corresponding to the actual requirement. If thusthe outer temperature as well as that of the heating fluid rises, the two thermostats cooperate for throttling the draft or the feeding of the fuel, but if the outer temperature alls more than correspondingto the normal temperature of the heatin fluid, the difference produces an effort of t e force transmitting devlice to increasethe draft or the feed of fue By adjusting the dimensions of a radiator according to a certain room or by adjusting its inlet opening in such a manner that it becomes sufiicient for a normal heating of the room at a certain temperature of the outer air, it becomes thus possible to maintain the normal temperature of the said room, even at a decrease of the outer temperature, by raising the temperature of the heatin' fluid (for instance water) passing the radiator, as it is also possible at an increasin outer temperature to ma-in-' tain the norma temperature of the room by reducing the temperature of the water circulating through the radiator.

Hitherto in such cases the "temperature of the heating fluid usually has been maintained at a constant degree and the temperature of the room has been regulated by increasing or decreasing the quantity of heating fluid circulating through the radiator in a unit of time.

In the accompanying drawing Figure 1 illustrates a heating boiler' arranged according to the invention, where the the water of the boiler.

g M aaiaear common actionof the thermostats is trans mitted to the damper b (Fig. 1) or to the fuel feeding valve 6 (Fig. 2).

The thermostats c and 01 according to Figs. 1-3 consist of closed metal casings which, as well as the conduit "6 connecting them, are completely. filled with a liquid (for instance acetone or petroleum) having an essentially greater coeflicient of expansion than that of the surrounding casing. With 1 the casing 0' there is connected an expansion member 2' which on the drawing is illustrated as a bellows placed in the casing and surrounded by the sensitive liquid. At the expansion of that liquid by heat the bellows-is compressed and lifts a pin h, resting upon its bottom, which pin thereby turns one end of a double lever f, causing the other end' of it to be lowered and by means of a wire connection or the 'like to. close the damper b or to throttle the valve 6 The bellows i'of course may be turned in a position opposite to that shown in Fig. 3, so

that its bottom turns upward, in which case p the bellows must be filled with the sensitive liquid.

.The operation of the thermostats is as follows If the outer temperature falls so much that.

the heat of the heating fluid in the boiler at that time is not sufiicient for maintaining the temperature in the room to be heated at the degree desired, the liquid in d and the conduit 6 is contracted and the bottom of the bellows sinks, whereby the damper is lifted or the fuel valve opened, the combustion thereby becoming more rapid and the water in the heating conduit more hot. If the outer temperature falls but the temperature of the heating water simultaneously is raised, the two thermostats counteract one another and the damper or the fuel valve remains 'in its position.

Havin now particularl described the nature 0% my invention and the manner of its operation, what I claim is:

In combination, a bellows thermostat, a

casing inclosing the thermostat, a second casing inclosing the first casing and spaced 7 therefrom, a pin slidable in said casings and thermostat and projecting from-the second casing,.'said pin engaging the lower end of" said thermostat,.a fluid receptacle indirect communication with the first casing, a second fluid receptacle, a conduit connecting said second receptacle to the first casing, and means operable by said pin for controlling a heating apparatus.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' n GUSTAF DALEN Witnesses:

JAcoB BAGG, WM. BEMAn BOMAN. 

